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A crack arrestor (otherwise known as a rip-stop doubler) is a structural engineering device. Being typically shaped into ring or strip, and composed of a strong material, it serves to contain stress corrosion cracking or fatigue cracking, helping to prevent the catastrophic failure of a device.
Typical O-ring and application. An O-ring, also known as a packing or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, forming a seal at the interface.
Cracks can be formed in many different elastomers by ozone attack, and the characteristic form of attack of vulnerable rubbers is known as ozone cracking.The problem was formerly very common, especially in tires, but is now rarely seen in those products owing to preventive measures.
Type A – O-ring pusher; Type B – O-ring metal bellows; Type C – flexible gasket (high temperature) metal bellows. Prior to API 682, 1st Edition, multiple seals were designated as being either “tandem” or “double” seals; however, advances in seal design had rendered these classic terms obsolete.
A Wills Ring or Cooper Ring is a form of all-metallic O-ring seal. They are used for extremely arduous service, such as sealing the head gasket of high performance piston engines . Hollow, metallic Wills Rings are used as they have better springback than yielding soft metal seals and higher temperature limits than elastomer O rings.
O-ring; O-ring boss seal; Piston ring; Glass-to-metal seal; Glass-ceramic-to-metal seals; Heat seal; Hose coupling, various types of hose couplings; Hermetic seal; Hydrostatic seal; Hydrodynamic seal; Inflatable seal Seals that inflate and deflate in three basic directions of operation: the axial direction, the radial-in direction, and the ...
Obturating rings are common in artillery, where the steel or cast-iron casing of the shell is too hard to practically deform to provide a tight seal for the propellant gases. An obturating ring which is called driving band made of a softer material is the standard solution for that problem.
A gasket (orange) used as a face seal to prevent flow from escaping from a pipe flange joint. In mechanical engineering, a face seal is a seal in which the sealing surfaces are normal to the axis of the seal.